It shows the comparison of the thought process of a healthy and an obese guy who pretty much say it all through their body language.
Notice the triangles on these guys. The happy guy has his triangle facing downward which indicate broad shoulders and a narrow waist and the not so happy guy has his triangle pointing his head thus indicating his broader waist than his shoulders.
The colours represent the thoughts and actions of these guys and what they actually mean is given at the bottom of the picture. The happy guy has got a lot of green on him, whereas the not so happy guy has very little green on him.
Our thoughts,actions and the diet we have exhibit the kind of person we are and you and only you can bring about a change if you are not feeling really happy all the time.
I don’t know what kind of person you are, but by looking at this picture you very well know in which frame do you fit. If you are in the not so happy frame then just flip the triangle and start turning things around for good.